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116篇 您的检索式:作者名="Jihoon"
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1Molecular approaches for the detection and monitoring of microbial communities in bioaerosols:A review显示文摘Bioaerosols significantly affect atmospheric processes while they undergo long-range vertical and horizontal transport and influence atmospheric chemistry and physics and climate change.Accumulating evidence suggests that exposure to bioaerosols may cause adverse health effects,including severe disease.Studies of bioaerosols have primarily focused on their chemical composition and largely neglected their biological composition and the negative effects of biological composition on ecosystems and human health.Here,current molecular methods for the identification,quantification,and distribution of bioaerosol agents are reviewed.Modern developments in environmental microbiology technology would be favorable in elucidation of microbial temporal and spatial distribution in the atmosphere at high resolution.In addition,these provide additional supports for growing evidence that microbial diversity or composition in the bioaerosol is an indispensable environmental aspect linking with public health.Keunje Yoo Tae Kwon Lee Eun Joo Choi Jihoon Yang Sudheer Kumar Shukla Sang-il Hwang Joonhong Park 2017Journal of Environmental Sciences2017,29,1:13
2Oxidative coupling of methane over LaAlO3 perovskite catalysts prepared by a co-precipitation method: Effect of co-precipitation pH value显示文摘Oxidative coupling of methane(OCM) was conducted over LaAlO3X catalysts that were prepared by a coprecipitation method using different co-precipitation pH values(X = 6–10). The aim is to investigate the effect of p H values on the catalytic activity of La AlO3 catalysts in this reaction. The results showed that the co-precipitation pH value affected greatly on the formation of chemical species of precipitate precursors in the co-precipitation step, leading to different phases of the finally obtained LaAlO3 catalysts.When the co-precipitation pH value increased up to 8, the lanthanum-related phases such as La2 O3 and La(OH)3 were gradually formed as by-products, preventing the formation of LaAlO3 perovskite crystalline structure and facilitating the formation of oxygen vacancies on catalyst surface. However, at pH value of9 or higher, the lanthanum content in the precipitate precursor was increased greatly. Not LaAlO3 perovskite but lanthanum-related phases were developed as main phases, reducing their catalytic activities in this reaction. Among LaAlO3 catalysts, the one prepared at pH = 8 showed the highest C2 yield due to its well-developed oxygen vacancies and electrophilic lattice oxygen. Therefore, the co-precipitation pH value strongly affected the LaAlO3 catalyst activity in OCM reaction. A precious pH control should be required to prepare various perovskite catalysts for the OCM.Yujin Sim Jihoon Yoo Jeong-Myeong Ha Ji Chul Jung 2019Journal of Energy Chemistry2019,28,8:4
3Self-Assembled Al Nanostructure/ZnO Quantum Dot Heterostructures for High Responsivity and Fast UV Photodetector显示文摘Light confinement induced by spontaneous near-surface resonance is inherently determined by the location and geometry of metallic nanostructures(NSs),offering a facile and effective approach to break through the limitation of the light-mater interaction within the photoactive layers.Here,we demonstrate high-performance Al NS/ZnO quantum dots(Al/ZnO) heterostructure UV photodetectors with controllable morphologies of the self-assembled Al NSs.The Al/ZnO heterostructures exhibit a superior light utilization than the ZnO/Al heterostructures,and a strong morphological dependence of the Al NSs on the optical properties of the heterostructures.The inter-diffusion of Al atoms into ZnO matrixes is of a great benefit for the carrier transportation.Consequently,the optimal photocurrent of the Al/ZnO heterostructure photodetectors is significantly increased by 275 times to ~1.065 mA compared to that of the pristine ZnO device,and an outstanding photoresponsivity of 11.98 A W-1 is correspondingly achieved under 6.9 MW cm-2 UV light illumination at 10 V bias.In addition,a relatively fast response is similarly witnessed with the Al/ZnO devices,paving a path to fabricate the high-performance UV photodetectors for applications.Sisi Liu Ming‑Yu Li Jianbing Zhang Dong Su Zhen Huang Sundar Kunwar Jihoon Lee 2020Nano-Micro Letters2020,12,9:3
4Dynamic Behavior and Deformation Analysis of the Fish Cage System Using Mass-Spring Model显示文摘Fish cage systems are influenced by various oceanic conditions, and the movements and deformation of the system by the external forces can affect the safety of the system itself, as well as the species of fish being cultivated. Structural durability of the system against environmental factors has been major concern for the marine aquaculture system. In this research, a mathematical model and a simulation method were presented for analyzing the performance of the large-scale fish cage system influenced by current and waves. The cage system consisted of netting, mooring ropes, floats, sinkers and floating collar. All the elements were modeled by use of the mass-spring model. The structures were divided into finite elements and mass points were placed at the mid-point of each element, and mass points were connected by springs without mass. Each mass point was applied to external and internal forces, and total force was calculated in every integration step. The computation method was applied to the dynamic simulation of the actual fish cage systems rigged with synthetic fiber and copper wire simultaneously influenced by current and waves. Here, we also tried to find a relevant ratio between buoyancy and sinking force of the fish cages. The simulation results provide improved understanding of the behavior of the structure and valuable information concerning optimum ratio of the buoyancy to sinking force according to current speeds.Chun Woo LEE Jihoon LEE Subong PARK 2015China Ocean Engineering2015,29,3:3
5Growth of BaTiO_3-Ag hybrid composite films at room temperature by aerosol deposition显示文摘Barium titanate (BaTiO3) and silver (Ag) composite film with high dielectric constant was grown at room temperature by an aerosol deposition method.The dielectric constant increases by 0.5 times after adding Ag to the BaTiO3 matrix,compared with pure BaTiO3.The high dielectric constant can be attributed to the percolation effect of Ag inclusions in the BaTiO3 matrix.The Ag was present in the form of discrete layer in the BaTiO3 film.The dielectric properties of BaTiO3 Ag were discussed in detail taking into account the changes in microstructures.Young Joon YOON Sung Hwan CHO Jihoon KIM Hyo Tae KIM Hong Koo BAIK Jong-Hee KIM 2012中国有色金属学会会刊:英文版2012,22,S3:2
6Ion shielding functional separator using halloysite containing a negative functional moiety for stability improvement of Li–S batteries显示文摘Lithium–sulfur batteries are one of the attractive next-generation energy storage systems owing to theienvironmental friendliness,low cost,and high specific energy densities.However,the low electrical conductivity of sulfur,shuttling of soluble intermediate polysulfides between electrodes,and low capacitretention have hampered their commercial use.To address these issues,we use a halloysitemodulated(H-M)separator in a lithium–sulfur battery to mitigate the shuttling problem.The H-M separator acts as a mutual Coulombic repulsion in lithium-sulfur batteries,thereby selectively permitting Lions and efficiently suppressing the transfer of undesired lithium polysulfides to the Li anode sideMoreover,the use of halloysite switches the surface of the separator from hydrophobic to hydrophilicconsequently improving the electrolyte wettability and adhesion between the separator and cathodeWhen sulfur-multi-walled carbon nanotube(S-MWCNT)composites are used as cathode active materialsa lithium–sulfur battery with an H-M separator exhibits first discharge and charge capacities of 1587 an1527 m Ah g-1,respectively.Moreover,there is a consistent capacity retention up to 100 cyclesAccordingly,our approach demonstrates an economical and easily accessible strategy for commercialization of lithium–sulfur batteries.Yong Min Kwon Jihoon Kim Kuk Young Cho Sukeun Yoon 2021Journal of Energy Chemistry2021,30,9:2
7Ceramic-metal package for high power LED lighting显示文摘灯光的轻射出的二极管(LEDs ) 在最近的年里在街光系统的地里画了大兴趣的高力量。分别地,为在商业市场的带的街光的成功的发射的关键参数是价格和轻效率,他们被材料极大地影响,尽最大努力使用的设计因素带了包裹。这篇文章介绍一个新图案和材料处理技术认识到包装带与的解决方案在价格和性能有益。合算的材料和处理技术能经由厚电影被认识到眼镜陶器的绝缘层和银售票员。用到在带的包裹的热水池的直接的热驱散的高度有效的热设计被表明。Yu Jin HEO Hyo Tae KIM Sahn NAHM Jihoon KIM Young Joon YOON Jonghee KIM 2012Frontiers of Optoelectronics2012,5,2:2
8Mimicking a Superhydrophobic Insect Wing by Argon and Oxygen Ion Beam Treatment on Polytetrafluoroethylene Film显示文摘Biological tiny structures have been observed on many kinds of surfaces such as lotus leaves and insect wings,whichenhance the hydrophobicity of the natural surfaces and play a role of self-cleaning.We presented the fabrication technology of asuperhydrophobic surface using high energy ion beam.Artificial insect wings that mimic the morphology and the superhydrophobocityof cicada’s wings were successfully fabricated using argon and oxygen ion beam treatment on a polytetrafluoroethylene(PTFE)film.The wing structures were supported by carbon/epoxy fibers as artificial flexible veins that were bondedthrough an autoclave process.The morphology of the fabricated surface bears a strong resemblance to the wing surface of acicada,with contact angles greater than 160°,which could be sustained for more than two months.Youngjong Lee Yonghoon Yoo Jihoon Kim Sriyulianti Widhiarini Baeho Park Hoon Cheol Park Kwang Joon Yoon Doyoung Byun 2009Journal of Bionic Engineering2009,6,4:2
9Improved Photoresponse of UV Photodetectors by the Incorporation of Plasmonic Nanoparticles on Ga N Through the Resonant Coupling of Localized Surface Plasmon Resonance显示文摘Very small metallic nanostructures,i.e.,plasmonic nanoparticles(NPs),can demonstrate the localized surface plasmon resonance(LSPR)e ect,a characteristic of the strong light absorption,scattering and localized electromagnetic field via the collective oscillation of surface electrons upon on the excitation by the incident photons.The LSPR of plasmonic NPs can significantly improve the photoresponse of the photodetectors.In this work,significantly enhanced photoresponse of UV photodetectors is demonstrated by the incorporation of various plasmonic NPs in the detector architecture.Various size and elemental composition of monometallic Ag and Au NPs,as well as bimetallic alloy Ag Au NPs,are fabricated on Ga N(0001)by the solid-state dewetting approach.The photoresponse of various NPs are tailored based on the geometric and elemental evolution of NPs,resulting in the highly enhanced photoresponsivity of 112 A W-1,detectivity of 2.4×1012 Jones and external quantum e ciency of 3.6×104%with the high Ag percentage of Ag Au alloy NPs at a low bias of 0.1 V.The Ag Au alloy NP detector also demonstrates a fast photoresponse with the relatively short rise and fall time of less than 160 and 630 ms,respectively.The improved photoresponse with the Ag Au alloy NPs is correlated with the simultaneous e ect of strong plasmon absorption and scattering,increased injection of hot electrons into the Ga N conduction band and reduced barrier height at the alloy NPs/Ga N interface.Sundar Kunwar Sanchaya Pandit Jae-Hun Jeong Jihoon Lee 2020Nano-Micro Letters2020,12,7:2
10Comparison of PM motor structures and sensorless control techniques for zero-speed rotor position detection显示文摘Bianchi N Bolognani S Jang Jihoon 2007IEEE Transactions on Power Electronics2007,22,6:1
11Outcomes of the Patients Who Were Postoperatively Diagnosed as Malignancy After Laparoscopic Distal Pancreatectomy显示文摘Jihoon Kim Ho-Seong Han Yoo-Seok Yoon Jai Young Cho Keun Soo Ahn Yujin Kwon 2012Surgical Laparoscopy, Endoscopy & Percutaneous Techniques2012,,5:1
12Particle size and alloying effects of Pt-based alloy catalysts for fuel cell applications显示文摘Myoung-ki Min Jihoon Cho Kyuwoong Cho 2000Electrochimica Acta2000,45,:1
13Assessment of visual disability using visual evoked potentials显示文摘Jihoon Jeon Seiyul O Sungeun K 2012BMC Ophthalmology2012,,12:1
14Particle size and alloying effects of Pt-based alloy catalysts for fuel cell applications显示文摘MIN Myoung-Ki CHO Jihoon CHO Kyuwoong 2000Electrochimica Acta2000,45,:1
15Error-pattern-correcting cyclic codes tailored to a prescribed set of error cluster patterns 显示文摘Park Jihoon and Moon Jaekyun 2009IEEE Transactions on Information Theory2009,55,4:1
16On the regularity of the axisymmetrie solutions of the Navier-Stokes equations 显示文摘CHAE Dongho LEE Jihoon 2002Math Z2002,239,4:1
17On the regularity of the axisymmetric solutions of the Navier-Stokes equations 显示文摘Chae Dongho Lee Jihoon 2002Math Z2002,239,4:1
18Cyclic redundancy check code based high-rate error-detection code for perpendicular recording 显示文摘Moon Jaekyun Park Jihoon and Lee Jun 2006IEEE Transactions on Magnetics2006,42,5:1
19Optimization of the pulse width and injection time in a double-pass laser amplifier显示文摘We have optimized the input pulse width and injection time to achieve the highest possible output pulse energy in a double-pass laser amplifier using two Nd:YAG rods. For this purpose, we have extended the Frantz–Nodvik equation by simultaneously including both spontaneous emission and pump energy variation. The effective pump energy of the flash lamp was 8.84 J for each gain medium. The energy of 1 J could be amplified to an output energy of 12.17 J with the maximum achieved extraction efficiency of 63.18% when an input pulse having a pulse width of 168 μs is sent 10 μs after the absorbed pump energy becomes the maximum value.Daewoong Park Jihoon Jeong Tae Jun Yu 2018High Power Laser Science and Engineering2018,6,4:1
20Tag-splitting:adaptive collision arbitration protocols for RFID tag identification显示文摘Myung Jihoon Lee Wonjun Srivastava J 2007IEEE Transactions on Parallel and Distributed Systerns2007,18,6:1
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